6-Hydroxy-2-naphthoic acid

Specifications

• CAS Number: 16712-64-4
• Purity: ≥ 99.5 % HPLC
• Grade: Industrial grade
• Molecular Formula: C11H8O3
• Molecular Weight: 188.18 g/mol
• Appearance: A pale brown, pale cream, or light brown powder.
• Application: An important organic synthesis intermediate, mainly used in the preparation of liquid crystal polymers (LCPs) and high-performance engineering plastics.

Documentation

• Certificate of Analysis (COA)
• Safety Data Sheet (SDS)

Production Manufacturer

Palkem India, based in Mumbai, India, is a prominent chemical company recognized for its reliable supply of high-quality chemicals across diverse industries. With a strong focus on customer satisfaction and continuous improvement, Palkem India has earned a reputation as a preferred supplier within the chemical sector. Offering an extensive product range, dependable delivery, and responsive customer service, Palkem India is well-positioned for ongoing growth and success.

Physicochemical properties

Physical Parameters

Parameter	Value / Description
Melting Point (MP)	248 - 250 °C
Boiling Point (BP)	407℃ (at 760 mmHg)
Density	~1.5 g/cm³ (Estimated for crystalline solid)
Specific Gravity	~1.5 (dimensionless, same as density in g/cm³)
Solubility	Water: Slightly soluble in hot water, very slightly soluble in cold water. Ethanol: Freely soluble. Ether: Soluble. Chloroform: Slightly soluble. Benzene: Slightly soluble. It also dissolves in aqueous alkaline solutions (due to deprotonation of the carboxylic acid and phenolic hydroxyl groups).
Refractive Index	~1.640 - ~ 1.716
Vapor Pressure	Very low at room temperature
Viscosity	-
Phase at Room Temperature	Solid at room temperature (typically a crystalline powder).

Chemical Parameters

Parameter	Value / Description
pH	A saturated aqueous solution would be weakly acidic due to the presence of both carboxylic acid and phenolic hydroxyl groups. The pKa of the carboxylic acid is likely around 3-4, and the pKa of the phenolic OH is around 9-10.
Chemical Stability	Stable under normal storage conditions. It is an acid and will react with bases. The solid is air-stable.
Flash Point	~ 214.1 ± 18.3 °C
Chemical Reactivity	Has both a hydroxyl (-OH) group and a carboxylic acid (-COOH) — so acid-base behavior, potential for hydrogen bonding, etc. (functional groups)
Functional Groups	- Hydroxyl (phenolic) / - Carboxylic acid
Spectroscopic Data (IR, NMR, etc.)	IR (Infrared): Strong, broad O-H stretch from carboxylic acid around 2500-3500 cm⁻¹, sharp O-H stretch from phenol ~3200-3600 cm⁻¹, strong C=O stretch from carboxylic acid around 1680-1720 cm⁻¹, aromatic C=C stretches around 1500-1600 cm⁻¹. ¹H NMR (Nuclear Magnetic Resonance): (in DMSO-d6) Aromatic proton signals in the region of δ 6.8-8.5 ppm. The carboxylic acid proton and phenolic proton are broad singlets, typically downfield. UV-Vis: Shows absorption in the ultraviolet region due to the naphthalene chromophore with substituted auxochromes (-OH, -COOH).

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